Antenna



FIG. 1 is a bottom perspective view of an antenna, showing our new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being identical thereto;

FIG. 3 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The broken lines in FIG. 5 depict portions of the antenna that form no part of the claimed design. 

CLAIM We claim the ornamental design for an antenna, as shown and described. 